(x-5)(x+5)
(6-y)(6+y)
(a-7)(a+7)
(1-c)(1+c)
(m-4)(m+4)
(n-2)(n+2)
(x-9)(9+×)
(11-d)(d +11)
(4+b)(b-4)
(a+12)(12-a)
(c-3)(3+c)
(8-b)(b+8)
(2x-3)(2x+3)
(4y-7)(4x+7)
(8a+5)(5-8a)
(9c-1)(1+9c)
(10+3d)(3d-10)
(11x-6)(6+11x)
(2m-0,7)(2m+0,7)
(1,2-5y)(1,2+5y)
(8n+0,6)(8n-0,6)
(0,9p+2)(0,9p-2)
(1,1d-8)(8+1,1d)
(0,1a+1)(1-0,1a)
(0,7x-3y)(0,7x+3y)
(1,3m-4n)(1,3m+4n)
(5a+0,4d)(0,4d-5a)
(2,5p+6q)(6q-2,5p)
(8c-2,1d)(2,1d+8c)
(0,9x+2y)(0,9x-2y)
(1/4a-0,9b)(1/4a+0,9b)
(2/5m-1,5n)(2/5m+1,5n)
(3/7x-1/2y)(3/7x+1/2y)
(4/9c-9/10d)(9/10d+4/9c)
(1/3a+6/7b)(6/7b-1/3a)
(1/4a-0,9b)(1/4a+0,9b)

(x-5)(x+5) = х² - 25(6-y)(6+y) = 36 - y²(a-7)(a+7) = a² - 49(1-c)(1+c) = 1 - c²(m-4)(m+4) = m² - 16(n-2)(n+2) = n² - 4(x-9)(9+×) = x² - 81(11-d)(d +11) = 121 - d²(4+b)(b-4) = b² - 16(a+12)(12-a) = 144 - a²(c-3)(3+c) = c² - 9(8-b)(b+8) = 64 - b²(2x-3)(2x+3) = 16x² - 9(4y-7)(4y+7) = 16y² - 49 (8a+5)(5-8a) = 25 - 64a²(9c-1)(1+9c) = 81c² - 1(10+3d)(3d-10) = 9d² - 100(11x-6)(6+11x) = 121x² - 36(2m-0,7)(2m+0,7) = 4m² - 0,49(1,2-5y)(1,2+5y) = 1,44 - 25y²(8n+0,6)(8n-0,6) = 64n² - 0,36(0,9p+2)(0,9p-2) = 0,81 - 4(1,1d-8)(8+1,1d) = 1,21d² - 64(0,1a+1)(1-0,1a) = 1 - 0,01a²(0,7x-3y)(0,7x+3y) = 0,49x² - 9y²(1,3m-4n)(1,3m+4n) = 1,69m² - 16n²(5a+0,4d)(0,4d-5a) = 0,16d² - 25a²(2,5p+6q)(6q-2,5p) = 36q² - 6,25p²(8c-2,1d)(2,1d+8c) = 64c² - 4,41d²(0,9x+2y)(0,9x-2y) = 0,81x² - 4y²(1/4a-0,9b)(1/4a+0,9b) = 1/16a² - 0,81b²(2/5m-1,5n)(2/5m+1,5n) = 4/25m² - 2,25n²(3/7x-1/2y)(3/7x+1/2y) = 9/49x² - 1/4y²(4/9c-9/10d)(9/10d+4/9c) = 16/81c² - 81/100d²(1/3a+6/7b)(6/7b-1/3a) = 36/49b² - 1/9a²(1/4a-0,9b)(1/4a+0,9b) = 1/16a² - 0,81b²Но пунктов за такой список можно было и побольше дать.